Aluminum block sandpaper holder



Dec.'16, 1958 F. w. RINGER ALUMINUM BLOCK SANDPAFER HOLDER Filed April15, 1957 INi/ENTOR in er BY 1M ATTORNEYS uuuuumu uuuuuu u United StatesPatent 2,864,208 ALUMINUM BLOCK SANDPAPER HOLDER Floyd Wilbur Ringer,Salina, Kans. Application April 15, 1957, Serial No. 652,918 1 Claim.(Cl. 51-487) The present invention relates to aluminum block sand paperholders, and more particularly to such devices used in the preparationof film for splicing.

The primary object of the invention is to provide an aluminum blocksandpaper holder which, being nonmagnetic, will be free from themagnetic particles removed from film having magnetically recorded soundcarried thereon.

A further object of the invention is to provide an aluminum blocksandpaper holder having a size somewhat smaller than the width of- 35mm. film for convenience in using, storing, and seeing the end of thefilm as the sanding operation is conducted.

A further object of the invention is to provide an aluminum blocksandpaper holder which is adapted to hold a plurality of sandpapersheets for successive use, and which is inexpensive to manufacture,simple to use, and completely effective in accomplishing the aboveobjects.

()ther objects and advantages will become apparent in the followingspecification when considered in the light of the attached drawings, inwhich:

Figure 1 is a top plan view of the invention.

Figure 2 is a fragmentary plan view of a strip of 35 mm. film from whichthe emulsion has been removed by the invention.

Figure 3 is an enlarged side elevation of the invention.

Figure 4 is a vertical cross-section taken substantially along the line4-4 of Figure 3, looking in the di rection of the arrows.

Figure 5 is abottom plan view of the thumb screw portion of theinvention.

Figure 6 is a perspective view of one of the sandpaper sheets shownfolded into position for attachment to the invention.

Referring now to the drawings in detail wherein like referencecharacters indicate like parts throughout the several figures, thereference numeral 10 indicates generally an aluminum block sandpaperholder constructed in accordance with the invention.

In the splicing of motion picture film strips, the production of astrong joint is absolutely necessary if the film is to serve withoutfuture failure. Satisfactory splices demand careful scraping withcomplete removal of the emulsion and binder coatings from the film base.

On some types of color film, the coatings are on both sides of the filmso that scraping of both surfaces to be joined is required. In allcases, the surfaces to be joined must be thoroughly cleaned, hence, ifthe back surface contains only a slight film of oil some difficulty maybe encountered in obtaining successful splices.

Sometimes this factor is overlooked and poor splices are mistakenlyattributed to the particular cement used, the splicing equipment, or tothe film base itself. If the film base is roughened on both the backsurface and front surface following the removal of the emulsion andhinder, the adhesive qualities, of the cement used will be materiallyimproved and the finished joint will have exceptional strength.

In the instant invention, the aluminum sanding block 10 is utilized toremove the emulsion and binder from the area 11 of a film strip 12across one end thereof so as'to prepare the film strip 12 for thesplicing action.

The aluminum block sandpaper holder 10 comprises a generally rectangularblock 13 having spaced parallel side walls 14, 15, spaced parallel endwalls 16, 17, a bottom wall 18, and a top wall 19. A threaded bore 20extends through the center of the top wall 19 downwardly through thebottom wall 18, as best seen in Figure 4.

A thumb screw, generally indicated at 21, includes a threaded shank 22adapted for threaded engagement in the threaded bore 20. A disc 23 isintegrally formed on the upper end of the threaded shank 22 in axialalignment therewith and extending perpendicularly thereto. A transversehandle 24 extends upwardly from the disc 23, as best seen in Figure 3,and has the opposite side surfaces thereof roughened as at 25 to providea secure finger grip. The opposite sides of the handle 24 are providedwith reinforcing blocks 26 which extend to the disc 23 to assist insecuring the handle 24 thereto.

The lower face of the disc 23 is provided with a downwardly offsetannular flange 27 to form one jaw with the top surface 19 of the block13 forming the other jaw between which is clamped the opposite ends 28of a strip of sandpaper 29.

A plurality of sandpaper strips 29 may be superposed and clamped betweenthe flange 27 and block 13, simultaneously and successively torn looseas they become worn.

Having thus described the preferred embodiment of the invention, itshould be understood that numerous structural modifications andadaptation may be resorted to without departing from the scope of theappended claim.

What is claimed is:

An aluminum block sandpaper holder comprising a rectangular body havingspaced parallel side walls, spaced parallel end walls arrangedperpendicularly to said side walls, a top wall, and a bottom wallarranged in spaced parallel relation to said top wall with said top andbottom walls perpendicular to said side and end walls, said body havinga threaded bore extending centrally through said top wall, said body andcentrally through said bottom wall, a thumb screw including an elongatedthreaded shank detachably engaged in said threaded bore, a discintegrally mounted axially on one end of said threaded shank andextending perpendicularly thereto, a handle integrally carried by saiddisc and extending therefrom oppositely from said threaded shank, and anintegral annular flange depending from said disc adjacent the peripheraledge thereof oppositely of said handle, said flange and the top wall ofsaid body cooperating to clamp therebetween the opposite ends of asandpaper strip wrapped around said body.

References Cited in the file of this patent UNITED STATES PATENTS1,520,642 Giroux Dec. 23, 1924 1,722,183 Thomas July 23, 1929 2,036,107Thomas Mar. 31, 1936 2,417,680 Decker Mar. 18, 1947

